package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * @Author Luming
 * @Date 2024/4/17 21:34
 * @Description:
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {
    
    private StringRedisTemplate stringRedisTemplate;
    
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }
        //2.基于token获取redis中的用户
        String key = LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash()
                .entries(key);
        //3.判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }
        //5.将查询到的Hash数据转化为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        
        //6.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        
        //7.刷新Token有效期
        stringRedisTemplate.expire(key, LOGIN_USER_TTL, TimeUnit.MINUTES);
        
        return true;
    }
    
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
